10 times 0.84 is 8.4 or 8.40 is completely fine as well.
Answer:
-4/3
Step-by-step explanation:
Use the slope formula:

-4 - 12/ 13 - 1
-16/12
Simplifies to -4/3
$9.78=100%
$9.65=?
9.65*100/9.78
=98.67%
%decrease=100%-98.67%
=1.33%
=1.3%
3 + 2 = 5
5 + 4 = 9
9 + 68 = 77
77 + 6974 = 7051
7051 + 87643 = 94694
94694 + 8654 = 103348